Quiz 2: Thorax Flashcards
origin of anterior scalene
C3-C6 transverse process
insertion of anterior scalene
1st rib
origin of middle scalene
C1-C2 transverse processes
C3-C7 transverse processes
insertion of middle scalene
1st rib
origin of posterior scalene
C5-C7 transverse processes
insertion of posterior scalene
2nd rib
scalene action
Ribs mobile: elevates upper ribs
Ribs fixed: flexes C-spine to SAME side
flexes neck
external intercostal origin/insertion
lower rib to upper margin of next lower rib
origin/insertion of internal intercostal
lower rib to upper margin of next lower rib
origin/insertion of innermost intercostal
lower rib to upper margin of next lower rib
external intercostal action
elevate ribs
support intercostal spaces
stabilize chest wall
internal/innermost intercostal action
depress ribs
support intercostal spaces
stabilize chest wall
subcostal origin/insertion
lower ribs to inner surface of ribs 2-3 below
subcostal action
depress ribs (expiration)
transversus thoracis origin
sternum and xiphoid process
transversus thoracis insertion
2nd - 6th ribs
tranversus thoracis action
weakly depress ribs
subclavius origin
1st rib
subclavius insertion
clavicle
subclavius action
steady clavicle in sternoclavicular joint
pectoralis minor origin
3rd-5th ribs
pectoralis minor insertion
coracoid process
pectoralis minor action
scapula downward causing inferior angle to move posteromedially
rotates glenoid inferiorly assists in respiration
Serratus Anterior superior part origin
1st to 9th ribs
Serratus Anterior intermediate part origin
1st to 9th ribs
Serratus Anterior inferior part origin
1st to 9th ribs
Serratus Anterior superior part insertion
scapula - costal and dorsal
Serratus Anterior intermediate part insertion
scapula - costal and medial border
Serratus Anterior inferior part insertion
scapula - costal surface medial border & costal dorsal on inferior angle
Serratus Anterior superior part action
lowers the raised arm
Serratus Anterior intermediate part action
draws scapula laterally forward
elevates ribs with shoulder is fixed
Serratus Anterior inferior part action
rotates inferior angle of scapula laterally forward
elevation of arm above 90 degress
pectoralis major clavicular part origin
clavicle
pectoralis major clavicular part insertion
humerus
pectoralis major clavicular part action
adduction
internal rotation
flexion
assist in respiration when shoulder is fixed
pectoralis major sternocostal part origin
sternum and costal cartilage
pectoralis major sternocostal part insertion
humerus
pectoralis major sternocostal part action
adduction
internal rotation
flexion
assist in respiration when shoulder is fixed
pectoralis major abdominal part origin
rectus sheath
pectoralis major abdominal part insertion
humerus
pectoralis major abdominal part action
adduction
internal rotation
coracobrachialis origin
scapula
coracobrachialis insertion
humerus
coracobrachialis action
flexion
adduction
internal rotation
diaphragm costal part origin
7th-12th ribs
diaphragm costal part insertion
central tendon
diaphragm costal part action
principal muscle of respiration
aids in compressing abdominal viscera
diaphragm lumbar part origin
medial part
L1-L3 vertebral bodies
intervertebral disks
anterior longitudinal ligament
diaphragm lumbar part insertion
central tendon
diaphragm lumbar part action
principal muscle of respiration
aids in compressing abdominal viscera
diaphragm sternal part origin
xiphoid process
diaphragm sternal part insertion
central tendon
diaphragm sternal part action
principal muscle of respiration
aids in compressing abdominal viscera